Hello folks! welcome back to a new section of our tutorial on ReactJS. In this section of our tutorial on ReactJS, we will be studying about how to create a Component in React using properties.
We are going to make a modification of our ExpenseEntryItem component and try to use properties.
Open up our expense-manager application in your favorite editor.
Open ExpressEntryItem file that is located in the the src/component folder.
Next, introduce construction function with the argument props.
We are going to make a modification of our ExpenseEntryItem component and try to use properties.
Open up our expense-manager application in your favorite editor.
Open ExpressEntryItem file that is located in the the src/component folder.
Next, introduce construction function with the argument props.
constructor(props) { super(props); }
Change the render method and populate the value from props.
render() { return ( <div> <div><b>Item:</b> <em>{this.props.name}</em></div> <div><b>Amount:</b> <em>{this.props.amount}</em></div> <div><b>Spend date:</b> <em>{this.props.spenddate.tostring()}</em></div> <div><b>Category:</b> <em>{this.props.category}</em></div> </div> ); }
Here,
- name represents the item's name of type string.
- amount represents the item's amount of type number.
- spendDate represents the item's Spend Date of type date.
- category represents the item's category of type String.
Now, we have succeeded in updateding the component using properties.
import React from 'react' import './ExpenseEntryItem.css'; import styles from './ExpenseEntryItem.module.css' class ExpenseEntryItem extends React.Component { constructor(props) { super(props); } render() { return ( <div> <div><b>Item:</b> <em>{this.props.name}</em></div> <div><b>Amount:</b> <em>{this.props.amount}</em></div> <div><b>Spend Date:</b> <em>{this.props.spendDate.toString()}</em></div> <div><b>Category:</b> <em>{this.props.category}</em></div> </div> ); } } export default ExpenseEntryItem;
Now, we can use the component by passing all the properties via attributes in index.js.
import React from 'react'; import ReactDOM from 'react-dom'; import ExpenseEntryItem from './components/ExpenseEntryItem' const name = "Grape Juice" const amount = 30.00 const spendDate = new Date("2022-05-01") const category = "Food" ReactDOM.render( <React.StrictMode> <ExpenseEntryItem name={name} amount={amount} spendDate={spendDate} category={category} /> </React.StrictMode>, document.getElementById('root') );
Next, serve the application making use of npm command.
npm start
Next, open the web browser and then enter http://localhost:3000 in the address bar and press enter.
Item: Grape Juice Amount: 30 Spend Date: Wed Jan 5 2022 8:53:00 GMT+0530 (West African Time) Category: Food
READ: ReactJS | Properties
The complete code to do it using CDN in a webpage is as follows -
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>React based application</title> </head> <body> <div id="react-app"></div> <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script> <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script> <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script> <script type="text/babel"> class ExpenseEntryItem extends React.Component { constructor(props) { super(props); } render() { return ( <div> <div><b>Item:</b> <em>{this.props.name}</em></div> <div><b>Amount:</b> <em>{this.props.amount}</em></div> <div><b>Spend Date:</b> <em>{this.props.spendDate.toString()}</em></div> <div><b>Category:</b> <em>{this.props.category}</em></div> </div> ); } } const name = "Grape Juice" const amount = 30.00 const spendDate = new Date("2022-05-01") const category = "Food" ReactDOM.render( <ExpenseEntryItem name={name} amount={amount} spendDate={spendDate} category={category} />, document.getElementById('react-app') ); </script> </body> </html>
Objects as Properties
Let us learn how to use JavaScript object as as attributes in this tutorial.
Open our expense-manager application in your favorite editor.
Next, open ExpenseEntryItem.js file.
Next, change the render() method and then access the input object item making use of this.props.item property.
Open our expense-manager application in your favorite editor.
Next, open ExpenseEntryItem.js file.
Next, change the render() method and then access the input object item making use of this.props.item property.
render() { return ( <div> <div><b>Item:</b> <em>{this.props.item.name}</em></div> <div><b>Amount:</b> <em>{this.props.item.amount}</em></div> <div><b>Spend Date:</b> <em>{this.props.item.spendDate.toString()}</em></div> <div><b>Category:</b> <em>{this.props.item.category}</em></div> </div> ); }
Next, open up theindex.js and represent the expense entry item in JavaScript object.
const item = { id: 1, name : "Grape Juice", amount : 30.5, spendDate: new Date("2022-05-01"), category: "Food" }
Next, pass the object to the component by making use of curly brace ({}) syntax in the component attributes.
<ExpenseEntryItem item={item} />
The complete code of index.js is as follows -
import React from 'react'; import ReactDOM from 'react-dom'; import ExpenseEntryItem from './components/ExpenseEntryItem' const item = { id: 1, name : "Grape Juice", amount : 30.5, spendDate: new Date("2022-05-01"), category: "Food" } ReactDOM.render( <React.StrictMode> <ExpenseEntryItem item={item} /> </React.StrictMode>, document.getElementById('root') );
Next, serve the application making use of npm command.
npm start
Next, open the web browser and then enter http://localhost:3000 in the address bar and press enter.
Item: Grape Juice Amount: 30 Spend Date: Wed Jan 5 2022 8:53:00 GMT+0530 (West African Time) Category: Food
The complete code to do it using CDN in a webpage is as follows -
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>React based application</title> </head> <body> <div id="react-app"></div> <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script> <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script> <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script> <script type="text/babel"> class ExpenseEntryItem extends React.Component { constructor(props) { super(props); } render() { return ( <div> <div><b>Item:</b> <em>{this.props.item.name}</em></div> <div><b>Amount:</b> <em>{this.props.item.amount}</em></div> <div><b>Spend Date:</b> <em>{this.props.item.spendDate.toString()}</em> </div> <div><b>Category:</b> <em>{this.props.item.category}</em> </div> </div> ); } } const item = { id: 1, name : "Grape Juice", amount : 30.5, spendDate: new Date("2022-05-01"), category: "Food" } ReactDOM.render( <ExpenseEntryItem item={item} />, document.getElementById('react-app') ); </script> </body> </html>
READ: ReactJS | Styling
Alright guys! This is where we are going to be rounding up for this tutorial. In our next tutorial, we will be studying about ReactJS Nested Components.
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Thanks for reading and bye for now.